43 



S. subdorsalis inferior lying ventral of 8. subdorsalis superior. 



8. dorsolateralis implanted on the oral edge of the segment 

 between s. dorsalis and s. suprastigmalio. 



In the descriptions I think it better to mention, whether these 

 setae are present or not, whilst I consider it advisable to make 

 a s()eoial notice of s. prostigmalis and s. propedalis as they often 

 show important deviations in size. 



Typ© Irt. A simplification of frequent occurrence is that the 

 seta subdorsalis disappears, whilst seta poststigmalis is united with 

 seta infr(isti(jtnali<A. 



Consequently we get one series in which the stigma is also 

 situated. This pattern, which at first sight makes a primitive im- 

 pression, is found i. a. in Saturnia pavonia. The setae have already 

 chang^ in instar / into rerrucae^ later on in scoli^ but one seta 

 dorsalis remains on the prothorax as a proof that here as every- 

 where else the verrucae have arisen by modification of the setae 

 (c. f. PI. I, fig. 20). 



Type \h. At the end of larval life the conditions of the pattern 

 are nearly the same in the Lymantridae = Liparidae, Here 

 however verruca subdorsalis does not disappear, but verruca dor- 

 salis does, whilst r. poststigmalis is blended with v. suprastigmalis 

 and not with p. infrastigmalis. This pattern I call type lb. 



Apparently the types la and 16 are almost alike, in reality 

 they have arisen independently of each other. 



The coalescence of v. poststigmalis and v. infrastigmalis re- 

 mains during all the larval instars and even in the pupa it is 

 represented by a furrow which separates the two halves from 

 each other (PI. I, fig. 21). 



Type II. At first sight the meso- and the metathorax seem to 

 possess a setal pattern which is entirely different from that of 

 the abdominal segments (PI. I, fig. 18). 



They agree, however, so much with the prothorax, that it does 

 not seem advisable to establish a special type for it but to 

 describe it as : type I without seta .... or : type II with 

 seta , etc. 



